最近在做海外市场的应用，接入Facebook登录认证。

  1. get token(client): https://developers.facebook.com/docs/facebook-login/manually-build-a-login-flow#confirm
  2. verify token(server): https://stackoverflow.com/a/8608017/2445042
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# facebook auth2
# curl -sSL 'https://graph.facebook.com/me?access_token=XXX'
curl -sSL 'https://graph.facebook.com/me?access_token=EAAMKdhBsxkYBAMFhvAw0Umgi2HblH1SXMcu6LawznlMs8f5cbvNylCywOIn3pfgX4Bp5G8Nz2Vn9ZAtx6k6GtOlxFD1PVAW9yiivT7sZAMTH26Sgg***SECRET***BVaNmV7QhSSJqmYyS4cYuK894eEp3wDBxtvJCJV0eJ7UlsXQh6e6TBJ5gNHDHBlHJsAAv4MuRoAqVLJ1xKjNVmZBmAc2zhTSrKOurmbea1'

{
  "name": "Ch** **n",
  "id": "601289***529408"
}

会返回第三方登录用户的唯一ID，还有用户昵称，录入数据库即可。